So can we talk about the inside and mold potential? anyone cut one of these open?

They break apart and the instructions say to break them open ( pull them apart) after using so they can dry. So zero mold problems here!!

Does anybody know the theory/principle behind this? Hoping to do for science project.

You can get the same effect with a straw in a glass of water. Insert straw, put finger over top, pull straw out and voila, water stays in the straw. I honestly couldn't get specific with the science of why this works, but it's something to do with air pressure. A quick Google search of "why does water stay in a straw" will get you more physics forums than you know what to do with, any of which could explain much better than I can, :D

Would this float, say if we wanted to bring it to the pool? Or does it fill very quickly and sink?

It does float. The cloud will only fill with water if you hold it under water and allow it to fill up. As far as sinking when it is full I remember it still floating because of the hole on top. I may be wrong though.

ASIN	B00IS5DJ5M
Age Range Description	Baby,Kid
Best Sellers Rank	#117,847 in Toys & Games ( See Top 100 in Toys & Games ) #1,027 in Bathtub Toys
Brand Name	MOLUK
Color	White
Customer Reviews	4.6 out of 5 stars 1,764 Reviews
Global Trade Identification Number	00843583003521
Included Components	1 Plui Cloud
Item Dimensions	3.62 x 2.76 x 2.95 inches
Item Height	7.5 centimeters
Item Type Name	Plui
Item Weight	0.15 Pounds
Manufacturer	PlayMonster LLC
Manufacturer Maximum Age (MONTHS)	1080.0
Manufacturer Minimum Age (MONTHS)	24.0
Manufacturer Warranty Description	No Warranty
Material Type	Plastic
Operation Mode	Manual
Size	Small
Theme	video-games
UPC	698887298780 843583003521 785924370162 885934172883 764999700890 885601064251 885332469929 885329088423 885601119586 067752439519 787793673948 885522599375 885591095723 885277244476 737923379936 885473880133 700985522237 793631417377 789264257954 885485196451 885610310189 885443479589 885486689631
Unit Count	1.00 Count

MOLUK Plui Rain Cloud Tub Toy

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